JPH04276404A - Metal lath for alc thin sheet and method for fixing it - Google Patents

Abstract

PURPOSE:To make positional accuracy of a metal lath high by arranging vertically the metal lath with an apparent diameter of perforation of a bending part being closest to the bottom face which is smaller than the diameter of a set pin main body and supporting it by means of a set pin wherein the lower part is changed gradually thinner. CONSTITUTION:A metal lath being parallel in the longer direction of a mold frame 1 is vertically arranged and bending parts 5a, 5b and 5c each one side of which is projected are provided at three positions on the metal lath. A set pin 2 is vertically perforated through perforations of each bending part at a specified distance and the lower end is inserted in a recessed part 4 on the bottom face of the mold frame and the upper end is supported on the upper edge of the mold frame 1. The diameter of the main body of the set pin 2 is e.g. 5mm and the part being lower than the lowermost bending part is gradually changed thin. The apparent diameter of the perforation on the horizontal face of the bending parts 5a and 5b of the metal lath 5 is e.g. 7.3mm and the diameter of the perforation at the bending parts 5c of the lowermost step is e.g. 3.9mm and at the bending part 5c, only the lower end part of the set pin 2 can be perforated.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing ALC thin plates having a thickness of 50 mm or less for use on the outer walls of buildings, and more particularly to improvements in a method for fixing metal laths used as reinforcing materials.

0002

[Prior Art] Conventionally, the thickness of A is generally 30 to 50 mm.
When manufacturing LC thin plates, as shown in FIGS. 4 and 5, metal laths 5 arranged vertically and parallel to the longitudinal direction of a rectangular box-shaped formwork 1 are set with two set pins 2 at predetermined intervals.
Clamp and fix. Thereafter, raw material slurry is injected and foamed, and when a predetermined period of time has elapsed and the material is in a semi-hardened state, the set pins 2 are removed, the mold is removed, and the material is cut into a predetermined thickness in the longitudinal direction using piano wire or the like. After that, it is cured with high temperature steam in an autoclave to become an ALC product. However, with this method, the metal lath is insufficiently fixed, so when the slurry is foamed, the metal lath is pressed upwards and horizontally and moves, which not only deteriorates its positional accuracy, but also leaves traces of the metal lath being pulled out of the set pin 2. There is a problem in that it remains in a pinched form, reducing the strength of the panel.

[0003] Furthermore, when the slurry has finished foaming and retains its fluidity, it is also possible to remove the supports used to arrange and fix the metal lath in the formwork, or to remove the metal lath that has become taut with the support. There is a method of burying the support inside and then pulling out only the support, and using the self-destructive properties of highly fluid slurry to fill in the traces left by the support.
JP-A-59-24616, JP-A-59-4121
Publication No. 7). However, this method does not depend on the quality of raw materials, the blending ratio,
Since the foaming speed and curing time of the raw material slurry vary depending on the reaction temperature, etc., it is difficult to control the period when the metal lath does not move under its own weight and maintains fluidity to the extent that no traces of the support are left behind. In addition, if the support is removed too late, traces of the support will remain in the form of holding the metal lath, reducing the strength of the panel.If the support is removed too early, the metal lath will shift due to its own weight and expansion of the slurry, causing the panel There are problems such as a decrease in the strength of the panel and exposure of the metal lath to the outside of the panel.

[0004] In addition, a round bar having a diameter equal to the thickness of the ALC thin plate is supported, a metal lath is placed between the round bars, and the raw material slurry is cast.After semi-hardening, the round bar is pulled out and the raw material slurry is immediately poured into the hole where the round bar was pulled out. There is a method of injecting it into the body (Utility Model Publication No. 51-46444, Japanese Patent Publication No. 48-1732). However, with this method, when pouring the raw material slurry into the mold, the round bars impede foaming and not only does it not result in uniform foaming, but also the strength decreases due to the marks left by the round bars even if the slurry is injected into the marks where the round bars were pulled out. There's a problem.

[0005]

[Problems to be Solved by the Invention] The present invention aims to solve the above-mentioned drawbacks and obtain an ALC thin plate that has high precision in positioning the metal lath within the panel and reduces the decrease in panel strength due to traces of supports within the panel. metal lath, set pin,
An object of the present invention is to provide a method for fixing the same.

[0006]

[Means for Solving the Problems] At least three bent portions each having a through hole through which a set pin is inserted are provided on one side of the metal lath arranged in the vertical direction, and the lower end of the metal lath closest to the bottom of the formwork is provided. A metal lath whose vertical apparent hole diameter in the vertical direction of the bent part is smaller than the diameter of the main body at the top of the set pin, and a set pin whose lower end is thinner than the main body perpendicular to the through hole of the metal lath. The lower end of the set pin is inserted into the recess on the bottom of the formwork, and the upper end of the set pin is supported by a support member placed on the upper edge of the formwork. It is characterized by being fixed inside.

[0007]

[Operation] As described above, this invention is provided with at least three bent portions protruding to one side, and the apparent hole diameter of the bent portion closest to the bottom of the formwork is larger than the diameter of the set pin body. Arrange metal laths with small dimensions vertically, insert set pins whose parts below the bent part become gradually thinner vertically, insert the lower ends into the recesses on the bottom of the formwork, and insert the upper ends into the molds. Since it is supported by the support member placed on the upper edge of the frame, even if the metal lath is pressed upward during foaming of the slurry, the bent part at the lower end prevents the metal lath from lifting up due to the thick part of the set pin. Furthermore, since the upper and lower ends of the set pin inserted through the bent portion of the metal lath are supported, it does not move in the horizontal direction either. Therefore, the metal lath in the product can maintain high positional accuracy.

Furthermore, the set pins for fixing the metal lath are thinner than conventional ones, and even if the number is reduced by half, the metal lath can be sufficiently fixed. As a result, compared to the conventional method, there are fewer marks from the set pins, their diameter is smaller, and they are located in the center, so there is almost no reduction in the strength of the product.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a perspective view of fixing a metal lath by the method of the present invention, FIG. 2 is a longitudinal cross-sectional view showing a state in which the metal lath is fixed, and FIG. 3 is a partially detailed view of FIG. 2. Metal laths 5 are vertically arranged parallel to the longitudinal direction of the rectangular box-shaped formwork 1, and the metal laths 5 are provided with three bent portions 5a, 5b, and 5c that protrude to one side. There is. One set pin 2 is inserted vertically into the through hole of each bent part at a predetermined interval, and its lower end is inserted into the recess 4 on the bottom of the formwork, and its upper end is placed on the upper edge of the formwork 1. It is supported by a support member 3. The main body diameter of the set pin 2 is 5 mm, and the portion below the lowest bent portion is gradually tapered.

The metal lath 5 has a wire diameter of 1 mm, a longest diagonal dimension of the opening of 26 mm, and a width of 15 mm, and three bent portions protruding to one side are provided at the same position over the entire length. The angle between each bent part and the metal lath plane is as shown in FIG. 3, where the angle α of the lowest bent part 5c is 1.
The angle β of the uppermost bent portion 5a is 60 degrees, and the angle γ of the intermediate bent portion 5b is 120 degrees. Further, the height H of the bent portion is 7.5 mm. As a result, the apparent diameter of the hole in the horizontal plane of the uppermost and intermediate bent portions 5a and 5b was 7.3 m.
m, which is larger than the main body diameter of the set pin 2, so the set pin can be inserted loosely, but the apparent diameter of the hole in the horizontal plane of the lowermost bent part 5c is 3.9 mm, which is smaller than the diameter of the set pin main body. Only the lower end of the set pin can be inserted. Therefore, the metal lath 5 does not move above the thin part of the set pin. Further, there may be three or more bent portions, but if the bent portions are located at the upper end, lower end, and middle portion of the metal lath, sufficient positional accuracy can be maintained for practical purposes. Note that the angle and height of the bent portion may be appropriately selected depending on the thickness of the set pin.

The cross section of the support member 3 is U-shaped, and through holes 3a and 3b are opened at a predetermined interval on the upper and lower horizontal surfaces.
The set pin 2 can be inserted vertically and loosely. The interval between the through holes 3a is appropriately selected depending on the thickness of the product. Further, a member 3c having a protrusion is fixed to the lower part of both ends,
It is placed on the upper edge 1a of the formwork 1 in a direction perpendicular to its longitudinal direction. The depressions 4 are formed in the form of grooves parallel to the longitudinal direction of the bottom surface of the form, and the intervals therebetween are equal to the through holes 3a of the support member. Therefore, the support member 3 can be arbitrarily set at a desired pitch in the longitudinal direction. The recess 4 may be a hole, but a groove is preferable for changing the spacing between the set pins and removing deposits.

According to the method of the present invention, six metal laths were set with a spacing of 37 mm, and five set pins were set for each metal lath so that two ends of the metal lath in the longitudinal direction and three set pins were equally spaced between them. (In addition, when manufacturing products with the same dimensions using the conventional method, seven set pins with a thickness of 9 mm are normally used for each metal lath.) After that, the raw material slurry is injected and foamed in the usual process. After a predetermined period of time has passed and the support member 3 has sufficiently hardened, the support member 3 is lifted up, the set pins are removed, the formwork is removed, and a thickness of 3
Cut into 7mm pieces. After that, it was cured with high temperature steam in an autoclave to a thickness of 37 mm, width of 600 mm, and length of 1820 mm.
An ALC thin plate product was obtained.

Thirty samples were taken from this product, and the deviation of the metal lath from a predetermined position in the width direction and thickness direction from the plate surface and edge surface was measured. As a result, the average deviation in the width direction of products made using the conventional method was 3.9 mm, with a standard deviation of 3.6 mm.
However, with this method, the average was 1.5 mm and the standard deviation was 0.
The deviation in the thickness direction was 4.2 mm on average with a standard deviation of 2.6 mm using the conventional method, but with this method the deviation was on average 1.7 mm with a standard deviation of 0.4 mm, significantly improving positional accuracy. .

[0014]

As described above in detail, by using the method of the present invention, the thickness of the setting pins can be reduced compared to the conventional method, and the number of setting pins can be reduced, and the setting position is also closer to the center. Moreover, the metal lath does not shift, improving positional accuracy. Furthermore, since the set pin removal marks are small, there is no need for repairs and no effort is required, there is no need to remove the set pins before hardening, and there is almost no decrease in strength. As a result, high-strength, high-quality ALC thin plate products can be stably manufactured.

[0015]

[Brief explanation of the drawing]

FIG. 1 is a perspective view illustrating a situation in which a metal lath is fixed.

FIG. 2 is a vertical cross-sectional view showing how the metal lath is fixed.

FIG. 3 is a detailed view of a portion of FIG. 2;

FIG. 4 is a perspective view showing a situation in which a metal lath is fixed using a conventional method.

FIG. 5 is a longitudinal cross-sectional view of FIG. 4;

[Explanation of symbols]

1 Formwork 2 Set pin 3 Support member 4 Hollow 5 Metal lath

Claims (2)

[Claims] [Claim 1] Set pins are inserted perpendicularly at predetermined intervals into through holes in bent parts that protrude toward one side of metal laths arranged vertically in parallel to the longitudinal direction of a rectangular box-shaped formwork. In the metal lath fixing structure for ALC thin plates, the metal lath has at least three bent parts, and the apparent hole diameter of the bent part closest to the bottom of the formwork is smaller than the diameter of the main body of the set pin. Metal lath for ALC thin plates characterized by its dimensions. 2. The lower end of the set pin, whose portion below the bent part of the metal lath closest to the bottom of the formwork is gradually tapered, is inserted into the recess on the bottom of the formwork, and the upper end of the set pin is inserted into the recess of the formwork. A method for fixing a metal lath for an ALC thin plate, characterized in that the metal lath is supported by a support member placed on the upper edge.